package com.dmpb.ping.core;

/**
 * Created by ysb on 2017/11/12.
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PingCore {

  public static boolean ping(String ipAddress) throws Exception {
    int  timeOut =  3000 ;  //超时应该在3钞以上
    boolean status = InetAddress.getByName(ipAddress).isReachable(timeOut);     // 当返回值是true时，说明host是可用的，false则不可。
    return status;
  }

  public static void ping02(String ipAddress) throws Exception {
    String line = null;
    try {
      Process pro = Runtime.getRuntime().exec("ping " + ipAddress);
      BufferedReader buf = new BufferedReader(new InputStreamReader(
          pro.getInputStream()));
      while ((line = buf.readLine()) != null)
        System.out.println(line);
    } catch (Exception ex) {
      System.out.println(ex.getMessage());
    }
  }

  public static boolean ping(String ipAddress, int pingTimes, int timeOut) {
    BufferedReader in = null;
    Runtime r = Runtime.getRuntime();  // 将要执行的ping命令,此命令是windows格式的命令
    String pingCommand = "ping " + ipAddress + " -n " + pingTimes    + " -w " + timeOut;
    try {   // 执行命令并获取输出
      System.out.println(pingCommand);
      Process p = r.exec(pingCommand);
      if (p == null) {
        return false;
      }
      in = new BufferedReader(new InputStreamReader(p.getInputStream()));   // 逐行检查输出,计算类似出现=23ms TTL=62字样的次数
      int connectedCount = 0;
      String line = null;
      while ((line = in.readLine()) != null) {
        connectedCount += getCheckResult(line);
      }   // 如果出现类似=23ms TTL=62这样的字样,出现的次数=测试次数则返回真
      return connectedCount == pingTimes;
    } catch (Exception ex) {
      ex.printStackTrace();   // 出现异常则返回假
      return false;
    } finally {
      try {
        in.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  //若line含有=18ms TTL=16字样,说明已经ping通,返回1,否則返回0.
  private static int getCheckResult(String line) {  // System.out.println("控制台输出的结果为:"+line);
    Pattern pattern = Pattern.compile("(\\d+ms)(\\s+)(TTL=\\d+)",    Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(line);
    while (matcher.find()) {
      return 1;
    }
    return 0;
  }
  public static void main(String[] args) throws Exception {
    String ipAddress = "192.168.1.2";
    System.out.println(ping(ipAddress));
    //ping02(ipAddress);
    System.out.println(ping(ipAddress, 5, 5000));
  }
}